Field-magnet structure.



'No.729,414'. 4 PATENTIBD MAY 26;"1903.

' H. G. REIST.

FIELD MAGNET STRUCTURE.

APPLICATION FILED APR. 11, 1902. no MODEL. I I .QSHEETS-SH'EET 2 y Hnr'Gfieisb". bq

No. 729,414. Pa ented May 26, 1903.

UNITED STATES PATENT OFFICE.

HENRY G. REIST, OF SCHENEGTADSQ NEW YORK, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

FIELD-MAGNET STRUCTURE.

$PECIFICATION forming part Of Letters Patent N0. 729,414, dated May 26,1903.

Application filed April 11,1902. Serial No. 192,357. (No model.)

To all whom it may concern: pole-tip is then put on and secures the coilin Be it known that I, HENRY G. REIST, a citiplace. This tip ispreferably composed of a zen of the United States, residing atSchenecplurality of laminated units 5, the laminatady, county ofSchenectady, State of New tions in each unit being secured by rivets 6,55' York, have invented certain new and useful a plurality of such unitsbeing fastened side Improvementsin Field-Magnet Structures, of by sideto the pole-pieces by transverse bolts which the following is aspecification. 7. Each unit pole-tip is cut away on each This inventionrelates to dynamo-electric side, as shown, to correspond with projectinggenerators of the revolving field-magnet type; lugs 8 on the pole-piecesin accordance with 60 x0 and its object is to improve certain featuresthe construction set forth in the patent to of construction wherebylateral and radial Thomson and Geisenhoner, No.571, l62,grantstresses onthe field-coils are better resisted ed November 17, 1896. thanheretofore. It is found that at high speeds the long coils The inventioncomprises braces secured are liable to vibrate, and in order to prevent65 against the sides of the field-coils and collars this I apply a braceto the side of each coil. on the driving-shaft connected by a rabbet-The brace is a casting having two flat plates joint with the plateswhich support theends 9, adapted to fit against the adjacent sides of ofthe field-coils. The braces are fastened to two coils. In afour-polemachine these plates the 'body of the field-magnet structure, prewillmake a dihedral angle of ninety degrees; 70 2o ferably by links fittinginto undercut slots in but if the machine has more than four poles thebraces and the body, and serve to prethis angle will be correspondinglyaltered. vent any lateral vibration of the coils with The plates areintegral with a boss 10 and reference to the pole-pieces on which theystrengthening-webs 11. The inner angle 12 are mounted. The rabbetedcollars and end of the boss stands close to a beveled face 13 75 platesresist centrifugal strains and assist in on the body-hub between twoadjacent shoulpreventing radial movement of the coils on ders 3. In thisbeveled face and in the boss the pole-pieces. 10 are cut registeringslots 14 15, each having In the accompanying drawings, Figure 1 is anundercut or enlarged inner end. A link an end view of a four-polerevolving field- 16is driven into the slots, having a web 17 80 I magnetembodying myinvention. Fig. 2 is a to fit said slots and flanges 18 tofit the enperspective view of a link. Fig. 3 is a similarged endsthereof. If necessary, one .or lar view of a wedge; Fig. 4 is a sideelevamore wedges 19 can be driven in over the tion, partly in sectionand partly broken flanges to insure afirm solid job. A sheet of away, ofone end of the field-magnet. Fig. 5 insulation 20 may be placed undereach plate 85 is an end view of the pole-tip. Figs. 6 and 7 before thelinks are driven in. are cross-sections thereof on the lines 6 6 7 7,The curved ends of the coils pass around respectively; and Fig. Sis aperspective view end plates 21, applied to each end of the pole of twoof the units of which the hub and polepieces and secured in place by thebolts 7, pieces are composed. which fasten the pole-tips in place. Tore- 0 40 On the driving-shaft 1 is mounted the body lieve the shearingstrain 011 these bolts, due. of the field-magnet consisting of a centeror to the centrifugal thrust of the coils and end hub and radialpole-pieces built up by as plates, when running at high'speeds and tosembling on the shaft a plurality of similar insure a solid immovableconstruction, I prounits 2, each composed of a given number of vide ineach end plate a rabbet 22, concen- 5 5 sheet-iron laminations rivetedtogether, as trio with the shaft, and on the shaft 1 place shown in Fig.8. The structure illustrated a collar 23, having a fia'nge'24, whichfits into has four field-poles; but it is evident that any the rabbet22. The collar is held in place by desired number may be provided for.At a nut 25, screwed on the shaft. The square the base of eachpole-piece is a shoulder 3 to engaging shoulders of the rabbet and themo support a field-coil 4, which is wound on a flange resist allcentrifugal strains on the end form and slipped on the pole-piece. Theplates and coil. It is evident that the relative positions of the rabbetand flange may be reversed, if desired.

My improvements securely lock together the body and coils, so that astrong solid structure is produced and all vibration or displacement ofparts is prevented.

I do not desire to restrict myself to the exact construction orarrangement of parts shown in the accompanying drawings, as the same maybe varied and modified Without departing from my invention.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is-

1. In a field-magnet structure, the combination With the coils, ofbraces applied to the sides thereof.

2. In a field-magnet structure, the combination with two adjacent coils,of a brace fitt ing the adjacent surfaces thereof.

3. A brace for field-magnet coils, comprising two plates making adihedral angle, a boss and strengthening-webs integral therewith, and anundercut slot in said boss.

4. In a field-magnet structure, the combination with a hub, ofpole-pieces and coils, braces applied to said coils, and means forfastening the braces to the hub.

5. In a field-magnet structure, the combination with a hub havingundercut slots, of pole-pieces and coils, braces applied to said coilsand having undercut slots, and links engaging with said slots.

6. In a field-magnet structure, the combination with a hub havingbeveled faces containing undercut slots, of pole-pieces and coils,braces fitting between adjacent coils and provided with undercut slots,and links each having a web and flanges to engage with said slots andfasten the braces to the hub.

'7. In a field-magnet structure, the combination with the pole-piecesand coils, of end plates between the coils and pole-pieces, and collarsconnected with said end plates by rabbet-joints.

8. In a field-magnet structure, the combination with the pole-pieces andcoils, of end plates between the coils and pole-pieces, and collarsconnected with said end plates by rabbet-joints concentric with the axisof rotation of the structure.

9. In a field-magnet structure, the combination with an end plate for acoil, havinga rabbet concentric with the driving-shaft, of a collarhaving a flange fitting into said rabbet.

In witness whereof I have hereunto set my hand this 0th day of April,1902.

HENRY G. REIST.

Witnesses:

BENJAMIN B. HULL, HELEN ORFORD.

